As I noted above, I find it hard to imagine that more than a tiny fraction of human beings will ever choose to engage in sex acts with animals, even if and when the taboo has been thoroughly deconstructed and the behavior mainstreamed by dozens of sympathetic stories in the media. I suspect the same is true about incest and polyamory. Most people will continue to live boring, mundane sex lives, monogamously committed to one human being of the opposite sex at a time.
So what, then, is there to worry about? Why is this cultural experiment a big deal?
Because it stands as a stunning testament to our ignorance about ourselves. Roughly 2,500 years since Socrates first raised the question of how we should live, several centuries since the Enlightenment encouraged us to seek and promulgate scientific knowledge about the universe and human nature, Western humanity seems to have come to the conclusion that we haven’t got a clue about an answer. There is no consensus whatsoever about what ways of life are intrinsically good or bad for human beings.
Get married and have kids? If that’s what you want, sounds good. Live in a polyamorous arrangement? As long as everyone consents, have fun. What about my intense desire to copulate with a horse? Just make sure no one gets hurt — with hurt defined in the narrowest of terms (covering physical harm and the violation of personal preferences).
That’s all we’ve got.